@bugsplat/elfy/dist/src/file-header.js

Tiny utility for parsing ELF/SELF files.

export const lengthOf64BitElfHeader = 64;
const elfMagic = [0x7f, 0x45, 0x4c, 0x46];
export class ElfFileHeader {
    constructor(segmentHeaderOffset, sectionHeaderOffset, segmentHeaderSize, segmentHeaderEntrySize, segmentHeaderEntryCount, sectionHeaderEntrySize, sectionHeaderEntryCount, stringTableIndex) {
        this.segmentHeaderOffset = segmentHeaderOffset;
        this.sectionHeaderOffset = sectionHeaderOffset;
        this.segmentHeaderSize = segmentHeaderSize;
        this.segmentHeaderEntrySize = segmentHeaderEntrySize;
        this.segmentHeaderEntryCount = segmentHeaderEntryCount;
        this.sectionHeaderEntrySize = sectionHeaderEntrySize;
        this.sectionHeaderEntryCount = sectionHeaderEntryCount;
        this.stringTableIndex = stringTableIndex;
    }
    static parse(data) {
        if (data.length < lengthOf64BitElfHeader) {
            throw new Error('Could not parse ELF header, invalid buffer!');
        }
        const isElf = data[0] === elfMagic[0]
            && data[1] === elfMagic[1]
            && data[2] === elfMagic[2]
            && data[3] === elfMagic[3];
        if (!isElf) {
            throw new Error('Could not parse ELF header, invalid ELF file!');
        }
        const is64Bit = data[4] === 0x02;
        if (!is64Bit) {
            throw new Error('Could not parse ELF header, 32-bit ELF files are not supported!');
        }
        const isLE = data[5] === 0x01;
        if (!isLE) {
            throw new Error('Could not parse ELF header, big endian is not supported!');
        }
        const view = new DataView(data.buffer, data.byteOffset, data.byteLength);
        const segmentHeaderOffset = view.getBigUint64(32, true);
        const sectionHeaderOffset = view.getBigUint64(40, true);
        const segmentHeaderSize = view.getUint16(52, true);
        const segmentHeaderEntrySize = view.getUint16(54, true);
        const segmentHeaderEntryCount = view.getUint16(56, true);
        const sectionHeaderEntrySize = view.getUint16(58, true);
        const sectionHeaderEntryCount = view.getUint16(60, true);
        const stringTableIndex = view.getUint16(62, true);
        return new ElfFileHeader(segmentHeaderOffset, sectionHeaderOffset, segmentHeaderSize, segmentHeaderEntrySize, segmentHeaderEntryCount, sectionHeaderEntrySize, sectionHeaderEntryCount, stringTableIndex);
    }
}
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